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<html>
  <head>
    <meta charset="UTF-8" />
    <title>Hello World!</title>
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  </head>
  <body>
    <h1>Calculate prime numbers</h1>
    <p></p>
    <button type="button" id="start">Start</button>
    <p id="status"></p>
    <p id="results"></p>
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</html>
